Every undeliverable number in your list is a credit spent on a message that never arrived. Number Verification checks whether each number is valid, active, and reachable before you send, so your delivery rates reflect genuine reach, not bounce rate.
Number Verification is a pre-send validation tool built into MessageWhiz. Before any message leaves your platform, it queries live carrier network data to confirm whether each number on your list is valid, active, correctly formatted, and reachable.
The result: only eligible numbers move forward. Every number that would have silently failed gets filtered out before you pay to send.
From API connection to real-time network checks to filtered, validated lists, MessageWhiz removes the guesswork so every message you send goes to a number that can actually receive it.
-Trigger validation programmatically via the MessageWhiz API
-Supports real-time checks for up to 5 numbers and large-scale async list validation.
Intelligent routing across global networks, backed by more than 99% delivery reliability.
Run a single number check or validate large-scale lists before any campaign launches.
Connect Number Verification directly to your existing workflows via the MessageWhiz API, with support for real-time checks and large-scale list validation.
Dedicated account managers available around the clock, included at no additional cost.
AI-powered routing and message tools work alongside verified lists to maximize campaign performance.
If your support team is centralized but your customers are spread across multiple countries, virtual local numbers let customers reach you at a local rate while your team handles calls from a single location.
Calls from unrecognized numbers get ignored. You can use a local virtual number to appear as a familiar, local caller in the markets you’re calling or messaging into, which signifcantly improves response rates.
For businesses running call centers, virtual numbers provide the foundation: dedicated inbound lines, consistent outbound caller IDs, and the ability to scale number volumes up or down based on operational needs.
Talk to our team about adding Number Verification to your messaging stack.
What is a phone number verification API?
A phone number verification API queries live carrier network data to confirm whether a number is valid, active, correctly formatted, and reachable before a message is sent. MMDSmart MessageWhiz includes this capability as a built-in feature across all supported channels.
What does Number Verification check for each number?
It confirms whether the number exists, identifies active versus inactive status, detects the network and operator, flags number portability (when a subscriber has changed carrier), checks correct formatting, flags unreachable subscribers, and documents the date of validation.
Does Number Verification work for WhatsApp and Viber as well as SMS?
Number Verification tells you if a number is valid and active. It does not tell you if a user has installed WhatsApp, Viber, Telegram, or other messaging application.
How do I access the phone number verification API?
Number Verification is accessed via the MessageWhiz API. You can trigger real-time single-number checks or submit large lists for bulk validation programmatically, making it straightforward to build pre-send verification into your existing workflows.
How does Number Verification reduce campaign costs?
By filtering out invalid, inactive, and unreachable numbers before a send, you avoid paying for messages that will never be delivered. For large-volume campaigns, even a modest reduction in undeliverable numbers produces immediate, measurable savings.
Does Number Verification work for large lists?
Yes. MMDSmart supports large-scale list validation as well as real-time single-number checks, so you can validate at whatever volume your campaigns require.
What is number portability, and why does it matter for messaging?
Number portability means a subscriber has moved from one mobile network carrier to another while keeping the same phone number. If your routing data does not reflect the current carrier, messages can fail or take longer to deliver. Number Verification detects ported numbers so your routing stays accurate.
Can I use a phone number verification API for OTP validation?
Yes. Confirming that a number is active before sending a one-time password reduces failed OTP deliveries and improves the verification experience for your users. MessageWhiz supports both OTP delivery and pre-send number validation in the same platform.
How often should I validate my contact lists?
They can. Calls from numbers that appear local to the recipient are significantly more likely to be answered than calls from unrecognized or international numbers. Using a local virtual number for outbound calls is a practical way to improve connection rates in markets where your team is not physically located.
How long does it take to get virtual numbers activated?
For actively maintained lists used in regular campaigns, running validation before each major broadcast is a good baseline. For imported or aging lists, validate before any send. MessageWhiz documents the validation date for each number so you can track how recently your data was confirmed.
Is Number Verification included in my MessageWhiz plan?
Speak to our team to confirm how Number Verification is priced for your account. Contact us at messagewhiz.com/contact/ or call 1 (888) 709-9187.
Number Verification is the process of querying live carrier network data to confirm whether a mobile number is valid, active, assigned to a reachable subscriber, and correctly formatted before a message is sent. It is distinct from format validation, which checks only that a number is structured correctly, and from two-factor authentication, which sends a code to a number to verify user identity. Number Verification confirms network-level reachability before any send occurs.
| Capability | What it does | Applies to |
| Pre-Send Number Validation | Queries live carrier data to confirm a number is valid, active, and reachable before a message is sent | SMS, WhatsApp, Viber, Telegram. However, it does not say if a phone with a valid number has those applications installed. |
| Format Checking | Confirms the number is correctly formatted for the target country and carrier | SMS, WhatsApp, Viber, Telegram. However, it does not say if a phone with a valid number has those applications installed. |
| Active vs Inactive Detection | Distinguishes between numbers that exist in a carrier database and numbers currently assigned to an active subscriber | SMS, WhatsApp, Viber, Telegram.However, it does not say if a phone with a valid number has those applications installed. |
| Number Portability Detection | Identifies when a subscriber has moved to a different carrier while retaining their number, keeping routing accurate | SMS, WhatsApp, Viber, Telegram. However, it does not say if a phone with a valid number has those applications installed. |
| Network and Operator Identification | Returns the current carrier and network for each number, enabling accurate channel routing | SMS, WhatsApp, Viber, Telegram. However, it does not say if a phone with a valid number has those applications installed. |
| Bulk List Validation | Validates large contact lists before a broadcast send, filtering unreachable numbers at scale | SMS, WhatsApp, Viber, Telegram, omnichannel. However, it does not say if a phone with a valid number has those applications installed. |
| Real-Time Single-Number Check | Confirms the status of an individual number in real time, suited for OTP flows and onboarding | SMS, WhatsApp, Viber, Telegram. However, it does not say if a phone with a valid number has those applications installed. |
| Validation Date Audit Trail | Documents the date and outcome of each validation, providing a timestamped record for every number in the list | All supported channels. |
